// 云函数入口文件
const cloud = require('wx-server-sdk')

cloud.init()
const db=cloud.database();
const _=db.command
// 云函数入口函数
exports.main = async (event, context) => {
  var search_key=event.search_key
  var num=event.num
  var page=event.page

  return await db.collection('topic').
  where({
    title:db.RegExp({
      regexp:search_key,
      options:'i'
    })
  })
  .skip(page)
  .limit(num)
  .orderBy('lastReplytime','desc')
  .get()


}